Heater control valve position

N2BUICK

Active Member
I remember a thread about this but can't locate it. Is the heater control valve supposed to be open while not on the car? I have an unknown, metal control valve that is open without vacuum.
I am doubting this as the heater flow would be continuous without vacuum source?
Which way are the turbo cars heater valves designed to operate?
 

N2BUICK

Active Member
That is what I was seeing with the unknown valve I have to install.
Thanks for the verification Anthony.
 

earlbrown

runs with scissors
I am doubting this as the heater flow would be continuous without vacuum source?
Which way are the turbo cars heater valves designed to operate?
Yes. That way if there's a failure, you'll still have a heated defroster in the winter by default.
 
Top